/*
 * Copyright (C) 2013 readyState Software Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.xuemei.utilslib.statusbar;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.os.Build;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.Gravity;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.FrameLayout.LayoutParams;
import java.lang.reflect.Method;

/**
 * <pre>
 *     author : ${xuemei}
 *     e-mail : 1840494174@qq.com
 *     time   : 2017/10/10
 *     desc   :Class to manage status and navigation bar tint effects when using KitKat
 *     translucent system UI modes.
 *     version: 1.0
 * </pre>
 */

public class SystemBarTintManager {

  static {
    // Android allows a system property to override the presence of the navigation bar.
    // Used by the emulator.
    // See https://github.com/android/platform_frameworks_base/blob/master/policy/src/com/android/internal/policy/impl/PhoneWindowManager.java#L1076
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
      try {
        Class c = Class.forName("android.os.SystemProperties");
        Method m = c.getDeclaredMethod("get", String.class);
        m.setAccessible(true);
        sNavBarOverride = (String) m.invoke(null, "qemu.hw.mainkeys");
      } catch (Throwable e) {
        sNavBarOverride = null;
      }
    }
  }

  /**
   * The default system bar tint color value.
   */
  public static final int DEFAULT_TINT_COLOR = 0x99000000;

  private static String sNavBarOverride;

  private final SystemBarConfig mConfig;
  private       boolean         mStatusBarAvailable;
  private       boolean         mNavBarAvailable;
  private       boolean         mStatusBarTintEnabled;
  private       boolean         mNavBarTintEnabled;
  private       View            mStatusBarTintView;
  private       View            mNavBarTintView;

  /**
   * Constructor. Call this in the host activity onCreate method after its
   * content view has been set. You should always create new instances when
   * the host activity is recreated.
   *
   * @param activity The host activity.
   */
  @TargetApi(19) public SystemBarTintManager(Activity activity) {

    Window win = activity.getWindow();
    ViewGroup decorViewGroup = (ViewGroup) win.getDecorView();

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
      // check theme attrs
      int[] attrs = {
          android.R.attr.windowTranslucentStatus, android.R.attr.windowTranslucentNavigation
      };
      TypedArray a = activity.obtainStyledAttributes(attrs);
      try {
        mStatusBarAvailable = a.getBoolean(0, false);
        mNavBarAvailable = a.getBoolean(1, false);
      } finally {
        a.recycle();
      }

      // check window flags
      WindowManager.LayoutParams winParams = win.getAttributes();
      int bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS;
      if ((winParams.flags & bits) != 0) {
        mStatusBarAvailable = true;
      }
      bits = WindowManager.LayoutParams.FLAG_TRANSLUCENT_NAVIGATION;
      if ((winParams.flags & bits) != 0) {
        mNavBarAvailable = true;
      }
    }

    mConfig = new SystemBarConfig(activity, mStatusBarAvailable, mNavBarAvailable);
    // device might not have virtual navigation keys
    if (!mConfig.hasNavigtionBar()) {
      mNavBarAvailable = false;
    }

    if (mStatusBarAvailable) {
      setupStatusBarView(activity, decorViewGroup);
    }
    if (mNavBarAvailable) {
      setupNavBarView(activity, decorViewGroup);
    }
  }

  /**
   * Enable tinting of the system status bar.
   *
   * If the platform is running Jelly Bean or earlier, or translucent system
   * UI modes have not been enabled in either the theme or via window flags,
   * then this method does nothing.
   *
   * @param enabled True to enable tinting, false to disable it (default).
   */
  public void setStatusBarTintEnabled(boolean enabled) {
    mStatusBarTintEnabled = enabled;
    if (mStatusBarAvailable) {
      mStatusBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
    }
  }

  /**
   * Enable tinting of the system navigation bar.
   *
   * If the platform does not have soft navigation keys, is running Jelly Bean
   * or earlier, or translucent system UI modes have not been enabled in either
   * the theme or via window flags, then this method does nothing.
   *
   * @param enabled True to enable tinting, false to disable it (default).
   */
  public void setNavigationBarTintEnabled(boolean enabled) {
    mNavBarTintEnabled = enabled;
    if (mNavBarAvailable) {
      mNavBarTintView.setVisibility(enabled ? View.VISIBLE : View.GONE);
    }
  }

  /**
   * Apply the specified color tint to all system UI bars.
   *
   * @param color The color of the background tint.
   */
  public void setTintColor(int color) {
    setStatusBarTintColor(color);
    setNavigationBarTintColor(color);
  }

  /**
   * Apply the specified drawable or color resource to all system UI bars.
   *
   * @param res The identifier of the resource.
   */
  public void setTintResource(int res) {
    setStatusBarTintResource(res);
    setNavigationBarTintResource(res);
  }

  /**
   * Apply the specified drawable to all system UI bars.
   *
   * @param drawable The drawable to use as the background, or null to remove it.
   */
  public void setTintDrawable(Drawable drawable) {
    setStatusBarTintDrawable(drawable);
    setNavigationBarTintDrawable(drawable);
  }

  /**
   * Apply the specified alpha to all system UI bars.
   *
   * @param alpha The alpha to use
   */
  public void setTintAlpha(float alpha) {
    setStatusBarAlpha(alpha);
    setNavigationBarAlpha(alpha);
  }

  /**
   * Apply the specified color tint to the system status bar.
   *
   * @param color The color of the background tint.
   */
  public void setStatusBarTintColor(int color) {
    if (mStatusBarAvailable) {
      mStatusBarTintView.setBackgroundColor(color);
    }
  }

  /**
   * Apply the specified drawable or color resource to the system status bar.
   *
   * @param res The identifier of the resource.
   */
  public void setStatusBarTintResource(int res) {
    if (mStatusBarAvailable) {
      mStatusBarTintView.setBackgroundResource(res);
    }
  }

  /**
   * Apply the specified drawable to the system status bar.
   *
   * @param drawable The drawable to use as the background, or null to remove it.
   */
  @SuppressWarnings("deprecation") public void setStatusBarTintDrawable(Drawable drawable) {
    if (mStatusBarAvailable) {
      mStatusBarTintView.setBackgroundDrawable(drawable);
    }
  }

  /**
   * Apply the specified alpha to the system status bar.
   *
   * @param alpha The alpha to use
   */
  @TargetApi(11) public void setStatusBarAlpha(float alpha) {
    if (mStatusBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
      mStatusBarTintView.setAlpha(alpha);
    }
  }

  /**
   * Apply the specified color tint to the system navigation bar.
   *
   * @param color The color of the background tint.
   */
  public void setNavigationBarTintColor(int color) {
    if (mNavBarAvailable) {
      mNavBarTintView.setBackgroundColor(color);
    }
  }

  /**
   * Apply the specified drawable or color resource to the system navigation bar.
   *
   * @param res The identifier of the resource.
   */
  public void setNavigationBarTintResource(int res) {
    if (mNavBarAvailable) {
      mNavBarTintView.setBackgroundResource(res);
    }
  }

  /**
   * Apply the specified drawable to the system navigation bar.
   *
   * @param drawable The drawable to use as the background, or null to remove it.
   */
  @SuppressWarnings("deprecation") public void setNavigationBarTintDrawable(Drawable drawable) {
    if (mNavBarAvailable) {
      mNavBarTintView.setBackgroundDrawable(drawable);
    }
  }

  /**
   * Apply the specified alpha to the system navigation bar.
   *
   * @param alpha The alpha to use
   */
  @TargetApi(11) public void setNavigationBarAlpha(float alpha) {
    if (mNavBarAvailable && Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
      mNavBarTintView.setAlpha(alpha);
    }
  }

  /**
   * Get the system bar configuration.
   *
   * @return The system bar configuration for the current device configuration.
   */
  public SystemBarConfig getConfig() {
    return mConfig;
  }

  /**
   * Is tinting enabled for the system status bar?
   *
   * @return True if enabled, False otherwise.
   */
  public boolean isStatusBarTintEnabled() {
    return mStatusBarTintEnabled;
  }

  /**
   * Is tinting enabled for the system navigation bar?
   *
   * @return True if enabled, False otherwise.
   */
  public boolean isNavBarTintEnabled() {
    return mNavBarTintEnabled;
  }

  private void setupStatusBarView(Context context, ViewGroup decorViewGroup) {
    mStatusBarTintView = new View(context);
    LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getStatusBarHeight());
    params.gravity = Gravity.TOP;
    if (mNavBarAvailable && !mConfig.isNavigationAtBottom()) {
      params.rightMargin = mConfig.getNavigationBarWidth();
    }
    mStatusBarTintView.setLayoutParams(params);
    mStatusBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
    mStatusBarTintView.setVisibility(View.GONE);
    decorViewGroup.addView(mStatusBarTintView);
  }

  private void setupNavBarView(Context context, ViewGroup decorViewGroup) {
    mNavBarTintView = new View(context);
    LayoutParams params;
    if (mConfig.isNavigationAtBottom()) {
      params = new LayoutParams(LayoutParams.MATCH_PARENT, mConfig.getNavigationBarHeight());
      params.gravity = Gravity.BOTTOM;
    } else {
      params = new LayoutParams(mConfig.getNavigationBarWidth(), LayoutParams.MATCH_PARENT);
      params.gravity = Gravity.RIGHT;
    }
    mNavBarTintView.setLayoutParams(params);
    mNavBarTintView.setBackgroundColor(DEFAULT_TINT_COLOR);
    mNavBarTintView.setVisibility(View.GONE);
    decorViewGroup.addView(mNavBarTintView);
  }

  /**
   * Class which describes system bar sizing and other characteristics for the current
   * device configuration.
   */
  public static class SystemBarConfig {

    private static final String STATUS_BAR_HEIGHT_RES_NAME        = "status_bar_height";
    private static final String NAV_BAR_HEIGHT_RES_NAME           = "navigation_bar_height";
    private static final String NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME =
        "navigation_bar_height_landscape";
    private static final String NAV_BAR_WIDTH_RES_NAME            = "navigation_bar_width";
    private static final String SHOW_NAV_BAR_RES_NAME             = "config_showNavigationBar";

    private final boolean mTranslucentStatusBar;
    private final boolean mTranslucentNavBar;
    private final int     mStatusBarHeight;
    private final int     mActionBarHeight;
    private final boolean mHasNavigationBar;
    private final int     mNavigationBarHeight;
    private final int     mNavigationBarWidth;
    private final boolean mInPortrait;
    private final float   mSmallestWidthDp;

    private SystemBarConfig(Activity activity, boolean translucentStatusBar,
        boolean traslucentNavBar) {
      Resources res = activity.getResources();
      mInPortrait = (res.getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT);
      mSmallestWidthDp = getSmallestWidthDp(activity);
      mStatusBarHeight = getInternalDimensionSize(res, STATUS_BAR_HEIGHT_RES_NAME);
      mActionBarHeight = getActionBarHeight(activity);
      mNavigationBarHeight = getNavigationBarHeight(activity);
      mNavigationBarWidth = getNavigationBarWidth(activity);
      mHasNavigationBar = (mNavigationBarHeight > 0);
      mTranslucentStatusBar = translucentStatusBar;
      mTranslucentNavBar = traslucentNavBar;
    }

    @TargetApi(14) private int getActionBarHeight(Context context) {
      int result = 0;
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        TypedValue tv = new TypedValue();
        context.getTheme().resolveAttribute(android.R.attr.actionBarSize, tv, true);
        result = TypedValue.complexToDimensionPixelSize(tv.data,
            context.getResources().getDisplayMetrics());
      }
      return result;
    }

    @TargetApi(14) private int getNavigationBarHeight(Context context) {
      Resources res = context.getResources();
      int result = 0;
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        if (hasNavBar(context)) {
          String key;
          if (mInPortrait) {
            key = NAV_BAR_HEIGHT_RES_NAME;
          } else {
            key = NAV_BAR_HEIGHT_LANDSCAPE_RES_NAME;
          }
          return getInternalDimensionSize(res, key);
        }
      }
      return result;
    }

    @TargetApi(14) private int getNavigationBarWidth(Context context) {
      Resources res = context.getResources();
      int result = 0;
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
        if (hasNavBar(context)) {
          return getInternalDimensionSize(res, NAV_BAR_WIDTH_RES_NAME);
        }
      }
      return result;
    }

    @TargetApi(14) private boolean hasNavBar(Context context) {
      Resources res = context.getResources();
      int resourceId = res.getIdentifier(SHOW_NAV_BAR_RES_NAME, "bool", "android");
      if (resourceId != 0) {
        boolean hasNav = res.getBoolean(resourceId);
        // check override flag (see static block)
        if ("1".equals(sNavBarOverride)) {
          hasNav = false;
        } else if ("0".equals(sNavBarOverride)) {
          hasNav = true;
        }
        return hasNav;
      } else { // fallback
        return !ViewConfiguration.get(context).hasPermanentMenuKey();
      }
    }

    private int getInternalDimensionSize(Resources res, String key) {
      int result = 0;
      int resourceId = res.getIdentifier(key, "dimen", "android");
      if (resourceId > 0) {
        result = res.getDimensionPixelSize(resourceId);
      }
      return result;
    }

    @SuppressLint("NewApi") private float getSmallestWidthDp(Activity activity) {
      DisplayMetrics metrics = new DisplayMetrics();
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        activity.getWindowManager().getDefaultDisplay().getRealMetrics(metrics);
      } else {
        // TODO this is not correct, but we don't really care pre-kitkat
        activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);
      }
      float widthDp = metrics.widthPixels / metrics.density;
      float heightDp = metrics.heightPixels / metrics.density;
      return Math.min(widthDp, heightDp);
    }

    /**
     * Should a navigation bar appear at the bottom of the screen in the current
     * device configuration? A navigation bar may appear on the right side of
     * the screen in certain configurations.
     *
     * @return True if navigation should appear at the bottom of the screen, False otherwise.
     */
    public boolean isNavigationAtBottom() {
      return (mSmallestWidthDp >= 600 || mInPortrait);
    }

    /**
     * Get the height of the system status bar.
     *
     * @return The height of the status bar (in pixels).
     */
    public int getStatusBarHeight() {
      return mStatusBarHeight;
    }

    /**
     * Get the height of the action bar.
     *
     * @return The height of the action bar (in pixels).
     */
    public int getActionBarHeight() {
      return mActionBarHeight;
    }

    /**
     * Does this device have a system navigation bar?
     *
     * @return True if this device uses soft key navigation, False otherwise.
     */
    public boolean hasNavigtionBar() {
      return mHasNavigationBar;
    }

    /**
     * Get the height of the system navigation bar.
     *
     * @return The height of the navigation bar (in pixels). If the device does not have
     * soft navigation keys, this will always return 0.
     */
    public int getNavigationBarHeight() {
      return mNavigationBarHeight;
    }

    /**
     * Get the width of the system navigation bar when it is placed vertically on the screen.
     *
     * @return The width of the navigation bar (in pixels). If the device does not have
     * soft navigation keys, this will always return 0.
     */
    public int getNavigationBarWidth() {
      return mNavigationBarWidth;
    }

    /**
     * Get the layout inset for any system UI that appears at the top of the screen.
     *
     * @param withActionBar True to include the height of the action bar, False otherwise.
     * @return The layout inset (in pixels).
     */
    public int getPixelInsetTop(boolean withActionBar) {
      return (mTranslucentStatusBar ? mStatusBarHeight : 0) + (withActionBar ? mActionBarHeight
          : 0);
    }

    /**
     * Get the layout inset for any system UI that appears at the bottom of the screen.
     *
     * @return The layout inset (in pixels).
     */
    public int getPixelInsetBottom() {
      if (mTranslucentNavBar && isNavigationAtBottom()) {
        return mNavigationBarHeight;
      } else {
        return 0;
      }
    }

    /**
     * Get the layout inset for any system UI that appears at the right of the screen.
     *
     * @return The layout inset (in pixels).
     */
    public int getPixelInsetRight() {
      if (mTranslucentNavBar && !isNavigationAtBottom()) {
        return mNavigationBarWidth;
      } else {
        return 0;
      }
    }
  }
}
